One of the symptoms of a broken timing belt is the engine when turned over with the starter will speed up and slow down in a rythmic pattern. Some of the cylinders have valvesâ¦ that are stuck open, so when the starter hits that part the engine will turn over faster, then slower, then faster etc.
Phenol, also known as phenolic acid, is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group bonded to a hydroxyl group. It is mildly acidic and requires careful handling due to its propensity to cause chemical burns. Phenol was first extracted from coal tar, but today is produced on a large scale from petroleum. It is an important industrial commodity as a precursor to many materials and useful
10 most extreme places on Earth. The term phenolic is used to refer to a few different substances made with phenol, an organic compound. It can describe a type of resin used to create various consumer items and is the name given to a class of plant-based chemical compounds.akeliteÂ®. Resin may be made by mixing simple phenol with any number of aldehydes, but the combination made with formaldehyde â known as phenolic formaldehyde resin (PF) â is the most widely used. It was the first synthesized resin, and was marketed under the brand name BakeliteÂ®.